Exercise mat



FIG. 1 is a perspective view of an exercise mat showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevation view, the right side being a mirror image thereof; and,

FIG. 5 is an rear elevation view, the front being a mirror image thereof. 

CLAIM The ornamental design for an exercise mat, as shown and described. 